Connection for electric conduits.



I ED STATES E GCW.

ED'WIN E. GREAVES, OF SYR-ACUSE, NEvV YORK, ASSXGNOR TG CItGUSE-HNDSCOMPNY, F SYRCUSE, NEW' YGRK, A COEYOBATIG@ OF NEVI YORK.

CONNECTION EGR ELECTRIC CG'NDUITS.

LQOJML Specification of Letters Patent.

Application filed July 25, 1912. Serai No. 711,430.

To all whom "it 'may Concern Be it known thatl l, EnwrN E. GznEAvEs, ofSyracuse, in the county of @nondegzi and State of New Y rk, haveinvented e certain new :uid useful Connection for Electric Conduits, ofwhich the following is a specificaion.

llhis invention hns for its 'object the pro-` duction of a. connectionfor conduits especially electrical conduits in which it is paw ticuinrlydesirable to have tight joints;'end the invention consists in thecombinations and constructions hereinafter set forth and cinirned.

in describing this invention reference is had to the accompanyingdrawing in which characters designate corresponding i in all the views.

Figure 1 is e longitudinal sectional View o e. conduit outlet b1. usedin electrical con- .';ruction, the 1ocx being provided with myy"a-ifition. F is en enlarged 'fragmenne' end ci such hex with one Fig.i3 is e Sectional View on line -f" Fig.

nipple 3 having en enlarged recess et the inner` end of the threadedpassage, the recese being preerel'ily rectangular in cross section.

5 is tiring forming part of the joint beween the nieinl'iers l, zysnidring being loei in the recess 4 and 'being formed of fielding.nen-resilient lor soft metal and be ine constructed te expend and spreadthe pipe 2 is i'zirned thcreinto, and tightly grip the weils of therecess end the periphery of the pipe.

is here siown the ring 5 is foi-ined .fith

eumferentiel groove and with en internelined face opposed to the end ofthe pi so that during the movement of the i into the ring 5, the pipewill engage the` inf.`e 'ad fece and cause the ring 5 to spread analtightly engr-ge the walls of the recess.

illustrated embodiment of my inventhe "ng is shown concave-convex insecti-n and the inner diameter thereof than the diameter of the threadedis preferably split in order that it may be readily inserted in therecess'li and also-in order that it will be expended outwardly as thepipe is turned thereinto.` As the pipe-2 turns into the ring it alsocauses the ring to spread laterali.,v and tightly engage the wells ofthe recess; und owing to the fact that the metei is yielding, thethreads of the pipe cut into the inner face of the metal ring, and owingto thespreeding and expending of the ring', ring without tearing theSeine.

What I claim is:

l. The combination et two conduit niembers, one heinfr sage, and 1 @ed othe pas and the other being e. pipe threading in the peut ge, end anexpansihie nud contractile rin;4 in the reeess, the ring being; formedof yieidi .icnr'esiiient inet-el., :ind in Jing en inclir d to the endof' the p'A .rni 1g in the the inner diameter of the ring being lessthan the diameter of the pztssage whereby the `end face of said pipeenga-ges the inner farce of the .ring and @euses-the ring to ex- 'pendand grip the iieiis ofthe recess and the periphery of the pipe,substantially as and ier the prnpe described.

2. The eon'iliineton' oi two conduitniexm a threaded peshers', one beingformed "with sage, find en eninrged r end of eeid p:- and the othermember being a pipe ternifg in. such passage, and s inetul ring locate(in the re Jess :indformed ess at the inner with a periphernicirenniierentiei groove,`

and the inner diameter vet the ring being less than that ot the pense-gewhereby the end of the pipe turnin. 'in the passage eugages the innerface of such ring and causes the seine te expand and. grip the Walls of10@ the other being e pipe e und a retaining oeing concevothe diameterof et the inner end nier iaee opposed 8 recess at the inner end m5 lessthan the 119 diameter of thel passa-ge whereby the end -ace of the pipeturning in seid pessege 'engages the mner eurve face of therlng andcauses the ring to expand and grip the wallsof-the .recess andthe-periphery of the pipe, substantiely as and for the purpose setforth.

recess, the ring Vthreading in-'the passage, and en expansible andcontractile transversely split ring in the being formed of yieidlng,non-reslhent metal, and having. anfxncrined Y innerface opposed to theend of the pipe turning in the passage, the inner diameter meen@ ofthering being less than the `diemebenof the hnssafe wherein* the end faceofthe pipe engages the inner face of the ring and causes the ring toexpand and grip thewa'lis 'of thereeess and the. periphery of ,thefpge1substantially and for the purpose .f1e scribed.

In ltestimony whereof, I have hereune signed my. name in thepreseneevfWe e testing witnesses, atrSyraeuse, in the winy of @rionda-ga.,and-State of 'New York-ibis 24th day of June, 1912;

EDWIN E. einenVi-3s- Witnesses:

B. SCHOENEc-K, TNM. CORNELL BLANDING.

